Impact on performance titanium heat treatment cycle

The phase transition in titanium stress is small, with a simple heat treatment, it is difficult to change the original casting organizations, especially the grain boundary organization. 
To refine casting titanium organization, people were cycling in the heat treatment. Volume effect of the use of the accumulation phase, resulting in 
And increased stress, prompting aerospace investment castings recrystallization, resulting in multilateral and grain refinement sheet of tissue. 
     Experimental results show that the alloy has Ti6A14v thick widmanstatten, the P-phase region through a ten cyclic heat treatment (980 a 
500 ℃), enables thin sheet first roughening, and broken off, so that the structure refinement. Then a continuous grain boundary is not 
Change, and even some coarsening. titanium precision casting  If the cyclic heat treatment (980 a 500 ℃, 10 times the water-cooled ten 900 ℃, 2h air-cooled) before pre-
P first heated to a broken fire zone (1010 ℃, water quenching), become fully martensite after cycle heating and cooling, a grain boundary 
Disappeared or broken off, the degree of refinement and organizational uniformity will increase its alloys have significantly improved fatigue performance.